CN106368673A - Measuring method for water content and crude output of carbon dioxide flooding high water content oil reservoir producing well - Google Patents

Measuring method for water content and crude output of carbon dioxide flooding high water content oil reservoir producing well Download PDF

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Publication number
CN106368673A
CN106368673A CN201610895468.0A CN201610895468A CN106368673A CN 106368673 A CN106368673 A CN 106368673A CN 201610895468 A CN201610895468 A CN 201610895468A CN 106368673 A CN106368673 A CN 106368673A
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CN
China
Prior art keywords
gas
output
producing well
oil
water content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610895468.0A
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Chinese (zh)
Inventor
吕新华
许寻
王进安
袁广均
周志龙
刘超
原俊峰
高志飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Zhongyuan Oilfield Co
Original Assignee
China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Zhongyuan Oilfield Co
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Application filed by China Petroleum and Chemical Corp, Exploration and Development Research Institute of Sinopec Zhongyuan Oilfield Co filed Critical China Petroleum and Chemical Corp
Priority to CN201610895468.0A priority Critical patent/CN106368673A/en
Publication of CN106368673A publication Critical patent/CN106368673A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34Arrangements for separating materials produced by the well
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/164Injecting CO2 or carbonated water
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08Obtaining fluid samples or testing fluids, in boreholes or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08Obtaining fluid samples or testing fluids, in boreholes or wells
    • E21B49/087Well testing, e.g. testing for reservoir productivity or formation parameters
    • E21B49/0875Well testing, e.g. testing for reservoir productivity or formation parameters determining specific fluid parameters

Abstract

The invention discloses a measuring method for the water content and the crude output of a carbon dioxide flooding high water content oil reservoir producing well, and belongs to the technical field of oil field tertiary oil recovery development. The measuring method comprises the steps that a separator and a gas flowmeter are used on site to accurately meter the liquid output and the gas output; and since natural gas in output gas is the solute natural gas of in-place crude and the solution gas-oil ratio is a definite value for a specific oil reservoir, a gas sampling device and a gas chromatograph are used for conducting site sampling analysis on the output gas to obtain the gas output of the natural gas, and the crude output and the water content are accurately calculated. According to the measuring method for the water content and the crude output of the carbon dioxide flooding high water content oil reservoir producing well, operation is easy, convenient and practicable, the result is accurate and reliable, under the condition that no analytical device needs to be added, crude output monitoring on the high water content oil reservoir subjected to carbon dioxide flooding can be achieved, and the safe production requirements are met.

Description

A kind of carbon dioxide flooding high water-cut reservoir producing well moisture content and crude output measurement Method
Technical field
The present invention relates to a kind of carbon dioxide flooding high water-cut reservoir producing well moisture content and crude output measuring method, belong to Tertiary oil production in oil field development technique field.
Background technology
Moisture content and crude output are the important manufacturing parameters of producing well, the crude output of all producing wells of an oil reservoir Sum constitutes oil reservoir total output, and the moisture content of an oil reservoir is also comprehensively determined by the moisture content of all single producing wells.Oil reservoir Moisture content and crude output for crude oil collect defeated, separate, metering, surface pipeline network design be all important reference index, Moisture content and crude output are also the index parameter weighing an oil reservoir economic benefit, therefore accurately measurement producing well moisture content and Crude output is significant.
The method of general measure producing well moisture content and crude output is in producing well wellhead using 1l sampler barrel timing Product fluid sample, after stratification, profit is weighed respectively, the oil now isolated also dissolved with a part of water, then with dehydration Instrument carries out dehydration and separates to oil, from which further follows that oil mass and the water yield, calculates moisture content and oil production during sampling, and then converse Crude oil daily output.
At present, carbon dioxide flooding technology is one of important technology that latter period of oilfield development improves recovery ratio, high water-cut reservoir When implementing carbon dioxide drive, producing well production fluid moisture content up to more than 80%.Because crude oil is differed greatly with water viscosity, crude oil Often it is in discrete state together with water, producing well crude oil instant productivity and water-cut variation are big, hence with normal during output Rule method timing sampling measure production fluid moisture content and crude oil daily output error larger it is difficult to correctly evaluate carbon dioxide drive Effect.For example, domestic certain implement carbon dioxide flooding technology improve recovery ratio producing well, same day in 3 parts of production fluids of wellhead, After routinely measuring method separates, is dehydrated, weighs, calculated moisture content is respectively 96.1%, 92.4%, 97.5%, right Answer crude oil daily output 8.78t, 17.12t, 5.63t.It is not difficult to find out, the 3 parts of sample measurement results taken out in the almost same time are missed Difference is very big, illustrates that general measuring method has been unsuitable for the effect assessment of High water cut carbon dioxide flooding oil reservoir.
Content of the invention
It is an object of the invention to provide a kind of carbon dioxide flooding high water-cut reservoir producing well moisture content and crude output measurement Method, to overcome prior art to cause greatly the inaccurate defect of carbon dioxide drive effect assessment because of measuring result error.
In order to realize object above, the technical solution adopted in the present invention is:
A kind of carbon dioxide flooding high water-cut reservoir producing well moisture content and crude output measuring method, are to utilize in-site installation Separator and gas flowmeter, accurately measure Liquid output and gas production, because natural gas is in-place oil in output gas Dissolved natural gas, are certain values for specific oil reservoir dissolved gas oil ratio, therefore, using gas sample sampling apparatuses and gas chromatograph Output gas spot sampling is analyzed, draws natural gas gas production, and then can accurately calculate crude output and moisture content.Specifically Step is as follows:
1) utilize separator and the gas flowmeter of measuring station installation, measure producing well Liquid output qlAnd gas production;
2) utilize gas sample sampling apparatuses to gather gas sample in production wellhead, using gas chromatograph, gas sample is carried out in laboratory Compound mensuration, determines natural Gas content in output gas, determines the daily output of producing well natural gas;
3) gas-oil ratio being obtained using oil test data or in-place oil high-voltage physics data, the daily output according to natural gas is true Determine oil production q of producing wello
4) according to the Liquid output q of producing welllWith oil production qoRelation, determine the average moisture content f of producing wellw:
fw=(ql-qo)/ql× 100%.
Beneficial effects of the present invention:
The present invention measures Liquid output and gas production using live separator and gas flowmeter, by scene take gas sample and Laboratory component analyses, determine natural Gas content in output gas, and then calculate daily oil production and moisture content.Easy and simple to handle easy OK, result accurately and reliably, in the case of need not increase analytical equipment, you can realize high water-cut reservoir and implement carbon dioxide flooding Crude output is monitored, and meets safety in production and requires.
Brief description
Fig. 1 is the schematic flow sheet of measuring method of the present invention.
Specific embodiment
Following embodiments are only described in further detail to the present invention, but do not constitute any limitation of the invention.
Embodiment 1
Carry out output taking the producing well that certain mentioned in background technology implements carbon dioxide flooding technology raising recovery ratio as a example Liquid and product gas analysis, specifically comprise the following steps that
1) producing well Liquid output and gas production are determined using separator and gas flowmeter: from live separator and gas Reading in effusion meter, the liquid yield of this producing well is 265m3/ d, gas yield is 7580m3/d;
2) gather gas sample according to gas sample sampling apparatuses in production wellhead, using gas chromatograph, gas sample is carried out in laboratory Compound mensuration, determines the daily output of natural Gas content and natural gas in output gas: collect 500ml output gas sample, using gas phase Chromatograph measures and produces constituents composition, and result see table 1;
Table 1 produces constituents composition table
As shown in Table 1, in output gas, the content percent of natural gas is 13.40%, the having a daily output of of natural gas: gas day Content percent=7580 × the 13.40%=1015.72m of yield × natural gas3/d;
3) oil reservoir gas-oil ratio 75.58m being obtained using oil test data or in-place oil high-voltage physics data3/ t, according to sky So daily output of gas, determines the oil production of producing well: calculating producing well crude output is 1015.72 ÷ 75.58=13.44t/d, And the crude oil average product that conventional method obtains is (8.78+17.12+5.63)/3=10.51t/d it is seen that two methods draw Result difference larger;
4) determine the average moisture content of producing well according to producing well Liquid output and oil production: according to Liquid output 265m3/ d counts Calculate moisture content: fw=(ql-qo)/ql× 100%=(265-13.44) ÷ 265 × 100%=94.93%, and conventional method obtains The crude oil average moisture content arriving is (96.1%+92.4%+97.5%)/3=95.33%, and the result that two methods draw has difference Not.
The measuring method of the present invention and result have obtained field study personnel and the accreditation at oil-water metering station, using routine side Method measures producing well moisture content and the big problem of crude output error is resolved.
Embodiment 2
Carry out production fluid taking certain producing well as a example and produce gas analysis, specifically comprise the following steps that
1) producing well Liquid output and gas production are determined using separator and gas flowmeter: from live separator and gas Reading in effusion meter, the liquid yield of this producing well is 54.9m3/ d, gas yield is 1246m3/d;
2) gather gas sample according to gas sample sampling apparatuses in production wellhead, using gas chromatograph, gas sample is carried out in laboratory Compound mensuration, determines the daily output of natural Gas content and natural gas in output gas: collect 500ml output gas sample, using gas phase Chromatograph measures and produces constituents composition, and result see table 2;
Table 2 produces constituents composition table
As shown in Table 2, in output gas, the content percent of natural gas is 22.84%, the having a daily output of of natural gas: gas day Content percent=1246 × the 22.84%=284.6m of yield × natural gas3/d;
3) oil reservoir gas-oil ratio 75.58m being obtained using oil test data or in-place oil high-voltage physics data3/ t, according to sky So daily output of gas, determines the oil production of producing well: calculating producing well crude output is 284.6 ÷ 75.58=3.77t/d, and The crude output that conventional method records is 2.61t/d, 0.89t/d, 2.19t/d, and crude oil average product is 1.90t/d it is seen that two The result difference that the method for kind draws is larger;
4) determine the average moisture content of producing well according to producing well Liquid output and oil production: according to Liquid output 265m3/ d counts Calculate moisture content: fw=(ql-qo)/ql× 100%=(54.9-3.77) ÷ 54.9 × 100%=93.13%, and conventional method obtains The crude oil water content arriving is 94.4%, 98.1%, 95.3%, and average moisture content is 95.93%, and the result that two methods draw is poor Not larger.
For verifying the accuracy of measuring method of the present invention further, metrological personnel has specially carried out 24 hours individual wells to this well Detection oil mass and liquid measure, the crude output drawing is 3.59t/d, and moisture content 93.32% is connect with the measurement result of the present invention very much Closely, accuracy and the reliability of the inventive method are demonstrated.

Claims (2)

1. a kind of carbon dioxide flooding high water-cut reservoir producing well moisture content and crude output measuring method it is characterised in that: the party Method includes: 1) determines Liquid output and the gas production of producing well;2) gather output gas and carry out component analyses, determine sky in output gas So Gas content, is calculated the natural gas daily output according to gas production;3) determine gas-oil ratio, be calculated according to the natural gas daily output Oil production;4) it is calculated the average moisture content of producing well according to Liquid output and oil production.
2. measuring method according to claim 1 it is characterised in that: comprise the following steps:
1) utilize separator and the gas flowmeter of measuring station installation, measure producing well Liquid output qlAnd gas production;
2) utilize gas sample sampling apparatuses to gather gas sample in production wellhead, using gas chromatograph, component is carried out to gas sample in laboratory Measure, determine natural Gas content in output gas, determine the daily output of producing well natural gas;
3) gas-oil ratio being obtained using oil test data or in-place oil high-voltage physics data, the daily output according to natural gas determines life Produce oil production q of wello
4) according to the Liquid output q of producing welllWith oil production qoRelation, determine the average moisture content of producing well: fw=(ql-qo)/ ql× 100%.
CN201610895468.0A 2016-10-13 2016-10-13 Measuring method for water content and crude output of carbon dioxide flooding high water content oil reservoir producing well Pending CN106368673A (en)

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CN110307880A (en) * 2018-03-27 2019-10-08 中国石油化工股份有限公司 Metering device and metering method suitable for High water cut experiment
CN110894782A (en) * 2018-08-24 2020-03-20 中国石油天然气股份有限公司 Method and device for determining gas storage capacity of oil reservoir and storage medium

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Publication number Priority date Publication date Assignee Title
CN110307880A (en) * 2018-03-27 2019-10-08 中国石油化工股份有限公司 Metering device and metering method suitable for High water cut experiment
CN110894782A (en) * 2018-08-24 2020-03-20 中国石油天然气股份有限公司 Method and device for determining gas storage capacity of oil reservoir and storage medium

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Application publication date: 20170201